archtesterd_connectivity

#!/bin/bash

#
# Initialize ------------------------------------------------------------
#

debug=0
logfile=/var/log/archtesterd_connectivity.log
statusfile=/var/log/archtesterd_connectivity.status
resultfile=/dev/tty

#
# Functions ------------------------------------------------------------------
#

#
# Debug printouts
#

function archtester_debug {
    if [ $debug = 1 ]
    then
	echo "archtester: debug: $*"
    fi
}

#
# One round of analysis ------------------------------------------------------
#

function archtester_analyze {

    archtester_debug Looking at interfaces

    #
    # Initialize analysis
    #
    
    v4found=0
    v4publicfound=0
    v6found=0

    #
    # Determine what interfaces we have
    #
    
    interfaces=`ifconfig -s|fgrep -v Iface|fgrep -v lo|cut -f1 -d' '`
    
    #
    # Look at each interface, and what addresses it provides
    #
    
    for interface in $interfaces
    do
	
	ifconfig $interface > /tmp/interface.$interface.data
	cat /tmp/interface.$interface.data |
	    sed 's/inet /inet addr: /g' |
	    grep 'inet addr:' |
	    cut -f2 -d: |
	    sed 's/^ *//g' |
	    cut -f1 -d' ' > /tmp/interface.$interface.addrs.v4
	cat /tmp/interface.$interface.data |
	    sed 's/inet6 /inet6 addr: /g' |
	    grep 'inet6 addr:' |
	    cut -f2- -d: |
	    sed 's/^ *//g' |
	    cut -f1 -d' ' > /tmp/interface.$interface.addrs.v6
	cat /tmp/interface.$interface.data |
	    sed 's/inet6 /inet6 addr: /g' |
	    grep 'inet6 addr:' |
	    sed 's/scopeid *0x20.link./Scope: Link/g' |
	    sed 's/scopeid *0x0.global./Scope: Global/g' |
	    sed 's/scopeid *0x5/Scope: Link/g' |
	    sed 's/^ *//g' |
	    sed 's/^.*Scope://g' |
	    sed 's/^ *//g' |
	    cut -f1 -d' ' > /tmp/interface.$interface.scopes.v6
	
	#
	# Determine from the IPv4 addresses what kind of IPv4 connectivity we have
	#
	
	for a in `cat /tmp/interface.$interface.addrs.v4`
	do
	    case $a in
		10.*) v4found=1;;      # RFC 1981
		192.168.*) v4found=1;; # RFC 1981
		172.16.*) v4found=1;;  # RFC 1981
		169.254.*) ;;          # RFC 5731
		0.0.0.0) ;;            # avoid special case if not assigned
		127.*) ;;	             # avoid localhost addresses
		*.*.*.*) v4found=1;
			 v4publicfound=1;;
		*) ;;                  # anything else, in case data is garbled
	    esac
	done
	
	#
	# Determine from the IPv6 address scopes what kind of IPv6 connectivity we have
	
	for s in `cat /tmp/interface.$interface.scopes.v6`
	do
	    case $s in
		Global) v6found=1;;
		*) ;;
	    esac
	done
	
    done
    
    archtester_debug V4: $v4found
    archtester_debug V4 public address $v4publicfound
    archtester_debug V6: $v6found
    
}

#
# Main program ------------------------------------------------------------
#

#
# Parse arguments
#

while [ $# -gt 0 ]
do
    case x$1 in
	x-debug)
	    shift
	    debug=1;;
	x-quiet)
	    shift
	    debug=0;;
	x-output)
	    shift
	    resultfile=$1
	    shift;;
	*)
	    echo "archtesterd_connectivity: unexpected argument: $1"
	    exit 1;;
    esac
done

archtester_analyze

count=0
if [ $v4publicfound = 1 ]
then
  count=`expr $count + 1`
fi
if [ $v6found = 1 ]
then
  count=`expr $count + 1`
fi

if [ $v4publicfound = 1 -o $v6found = 1 ]
then
    mode=good
else
    if [ $v4found = 0 ]
    then
	mode=search
    else
	mode=bad
    fi
fi
echo $mode:$count > $resultfile
archtester_debug "Analysis result = $mode"
if [ -f $statusfile ]
then
  prevmode=`cat $statusfile`
else
  prevmode=none
fi
if [ $mode = $prevmode ]
then
    nop=nop
else
    date >> $logfile
    echo mode=$mode v4=$v4found public=$v4publicfound v6=$v6found >> $logfile
    prevmode=$mode
fi
echo $prevmode > $statusfile